diff --git a/lib/filesystem.js b/lib/filesystem.js
index 291918c..e883d25 100755
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -94,7 +94,7 @@ function fsSize(callback) {
             macOsDisks = [];
           }
         }
-        if (_linux) { cmd = 'df -lkPTx squashfs | grep ^/'; }
+        if (_linux) { cmd = 'df -lkPTx squashfs | grep  -E "^/|^.\\:"'; }
         if (_freebsd || _openbsd || _netbsd) { cmd = 'df -lkPT'; }
         exec(cmd, function (error, stdout) {
           if (!error) {